puppeteer: Remove waitFors on deletion spinners.
puppeteer: Remove waitFors on deletion spinners.

Also added a waitFor for the modal to disappear and removed
waitFor for the spinner to hide which would obviously be hidden
with modal and it also doesn't add much value.

andersk/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,zulip/zulip,rht/zulip,kou/zulip,zulip/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,andersk/zulip,andersk/zulip,andersk/zulip,kou/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,rht/zulip,rht/zulip,rht/zulip,zulip/zulip,zulip/zulip,kou/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,rht/zulip